I'm a little over 6' and skinny (hence the need of a wetsuit) Should I
* Get a winter weight wetsuit (5/3mm) from mountain warehouse
* Nah, won't need that much, a Gull 3/2 sleeveless will be fine - can get a jacket later if feel the need
* Save £70, suffer for the day and think about it another time
Really I'm trying to figure out whether 5/3 would be crazy hot or 3/2 far too cold; just go for a full suit or whether layering over a Gull would provide more options. As I haz worn a wetsuit once, about 4 years ago, I could do with any pointers.